Isoquinolone derivatives



United. States. Patent 2,809,969- ISQQUINOLQNE DEREYATIVES.

Merrill Eugene Specter, Kalamazoo, Mich, assignor to BristoPLaboratories Inc., Syracuse, N: Y'., a corporation of New York l No Drawing. Application Noyenrlrer.7, :125,5,, 7 1 .a. ..Nu.. .4.5..2.2..

6 Claim s. (01.26%:24515);

wherein X represents an alkylene radical containing two to four carbon atoms and B represents di-(lower)alkylamino, piperidino, morpholino, pyrrolidino, N'-(lower) alkylpiperazino or pipecolino.

The compounds of this invention are useful in medicine as antispasmodic agents and as central nervous system depressants, e. g. as anti-convulsants, sedatives, analgesics or tranquillizers. The free bases are useful as intermediates in the preparation of the quaternary salts, which are useful as germicides and disinfectants.

The compounds of this invention are prepared by reacting a N-dialkylaminoalkyl-benzylamine with acetylmandelyl chloride to give an O-acetyl-N-benzylrN-dialkylamino-alkylmandelamide which is then cyclized by reaction with sulfuric acid to give the desired 2-dialkylaminoalkyl-4-phenyl-l,2,3,4-tetrahydro-3-isoquinolone.'

The following examples will serve to illustrate the invention without limiting it thereto.

EXAMPLE I A. O-acetyl-N-dimethylaminoethyl-N-benzylmandelamide Solid '2 vm. a

4 nalysis.Caleulated for CzrHzsNzOaz e s l ts f i e A large part of the starting material may be-isolated from the mixture of hydrochloride salts removedfrom the reaction mixture byfiltration.

B. 2. dimethylaminoethyli-phenyl l,2,3,4-tetrahydro 3 isoquinolone hydrogen sulfate 1, concentrated, leaving as the r esidual oil Z-dimethylaminoethyl-4-phenyl-1,2,3,4-tetrahydro-3 isoquinolone.

This residual oil is dissolved in. 40 ml. of isopropyl alcohol and excess, concentrated sulfuric acid is added. The sulfate salt separates on cooling and melts at 183- 184 C. after recrystallization from isopropyl alcohol-ethyl acetate.

Analysis.-Calculated for CrsHzzNzO-HzSOs:

Calculated I Found The solid quaternary salt, 2-dimethylaminoethy1-4- phenyl-l,2,3,4-tetrahydro-3-isoquinolone methiodide is prepared by refluxing the free base in ten moles of methyl iodide for eighteen hours and then removing the excess methyl iodide by distillation in vacuo.

EXAMPLE II 2 beta N piperidylethyl-4-phenyl-l,2,3,4-tetrahydro- 3-isoquinolone, its sulfate salt and its methiodide are prepared according to the procedures set forth in detail in Example I, using N-beta-piperidylethyl-benzylamine in place of N-dimethylaminoethyl-benzylamine.

Using the procedure set forth in detail in Example I, N diethylaminoethyl benzylamine, N-di-n-butylaminoethylbenzylamine, N- ethylmethylaminoethylbenzylamine, N [2 (a pipecolyl) ethyl] benzylamine, N-B- morpholinylethyl-benzylamine, N-[fi-(4-ethylpiperazyl)- ethyl]-benzylamine, N--pyrrolidylethylbenzylamine, N- (pdiethylamino-propyl)- benzylamine, N- (B- piperidylpropyl) benzylamine, N (,3 piperidyl a methyl ethyl) benzylamine, N (,8 dimethylamino amethylpropyl)- benzylamine, N- (5- diethylaminoa,)3- dimethylethyl)-benzylamine and N-(B-piperidyl-u,fldimethyl-ethyl)-benzylamine are used to prepare 2-diethylaminoethyl 4 phenyl 1,2,3,4 tetrahydro 3- isoquinolone, 2 di n butylaminoethyl 4 phenyl- 1,2,3,4 -tetra-hydro 3 isoquinolone, 2 ethyl methylaminoethyl 4 phenyl 1,2,3,4 tetrahydro 3 isoquinolone, 2-[2-(a-pipecolyl)-ethyl]-4-phenyl-l, 2, 3, 4- tetrahydro 4 3 isoquinolone, 2 p (morpho1inyl)ethyl- 4 phenyl l,2,3,4 tetrahydro 3 isoquinolone, 2 [5- '(4 ethylpiperazyhethyl] 4 phenyl 1,2,3,4 tetrahy- Patented; oa 1 5,; 1957" sufiates, hydrobromides,tcitrates, acetates, tartrates, berry zoates, maleates and the lilgeand by treatrnent yith alkyl;

halides or alkyl sulfatesnto quaternarylsalts. such as methochlorides, methobromides, methiodides, ethiodides,

ethochlorides, ethyl sulfates and the like.

elclaim: 1. A member selected from'the group consisting of compounds having the structure t r 4 wherein X represents an alkylene radical containing two 7 to four carbon atoms inclusive and B represents a memher selected from the group consisting of di-(lower)alkylamino, piperidino, morpholino, pyrrolidino, N-(lower) alkyl-piperazino and pipecolino; and non-toxic acid addition salts and quaternary salts of said compounds.

2. 2 dimethylaminoethyl 4 phenyl 1,2,3,4 tetrahydro-3-isoquinolone.

3. 2 beta N piperidylethyl 4 phenyl 1,2,3,4-

tetrahydro-3-isoquinolone.

4. 2 [2 (a pipecolyl) ethyl] 4 phenyl 1,2,3,4- tetrahydro-3-isoquin0lone.

5. 2 p (morpholinyl)ethyl 4 phenyl 1,2,3,4-

" tetrahydro-3-isoquino1one.

6. 2 3 diethylamino)propyl] 4 phenyl 1,2,3,4- tetrahydro-3-isoquino1one;

No references cited. 

1. A MEMBER SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS HAVING THE STRUCTURE 